I installed the update this morning for EMClient and all of my calendar information was lost.  How do I get it back?

Hello Melanie,
which account was this calendar connected to?
Was this a Google Calendar, iCloud calendar, other CalDAV service or Local calendar?
Do you have Local folders enabled if it’s tha last option? If so, go to Menu>Tools>Settings>General>General (Show Local folders).
Are there any error message in Menu>Tools>Operations window? If so, please copy the error message and the log from the Log tab.